Jack



Patented sept. 14,1926. y

UNITED STATES y 1,600,128 APrarlezlarorner..y

. Axial. o. NInLsEN, or nACINE,w1scoNs1N, AssIGNoB To'NIELsEN MACHINEcoM'PANY, A PARTNERSHIP courosnn or A. o. NmLsEN AND c. c.` NIELSEN, oFRACINE,

WISCONSIN.

JACK.

' Application mcd January zo, 192e. serial No. 82,537. p

My said invention relates to a jack suc as is-uscd for liftingautomobiles and the like and it is an object of my invention t providequlckly acting mean-s for raising n and lowering heavy ob]ects.

A further object of my inventionv is to provide quickly acting means forpos'tioning the lifting elements of the jack.

Referring to the accompanying drawings,

le which are made a art hereof, and onwhich similar reference c aractersindicate similar parte?, i,

Figure 1 is a side` elevation of. my device.A Figure 2, a plan. Figure3,'a section on 2, and

Figure 4,a fragment of the invention. In' the drawings referencecharacters 1() indicate intermediate side members of the frame of thejack, said frame carrylng a lifting device '11 vby means of a lever 12fulcrumed at 13 on front frame members 14 and pivotally connected at 15to rod 16.

Links 17 are pivotally connected at one end to the lifting device and atthe vother end to frame members 14, as indicated at 18.

The rod 16 -is threaded at its rear end for engagement with an internalthread on a nut 19 provided with peripheral teeth to form a ratchetbearing at its rearside 'against a block 20, which serves 'as a supportfor the ratchet nut.l The block is supported by trunnions indicated at21, which trunnions are mounted for limited oscillation in bearings onthe side frame members and said block is provided with a ball-thrustbearing (not shown) against which a collar 15 line 3--3 of Figure o; amodified form on thezratchet bears for the vpurpose of re i ducingfriction.n Q A pair of oppositely facing inwardly-d1- rected pawls 22are arranged lfor engagement with the ratchet, these pawls being springpressed toward the ratchet and being slidable in bearings 23 fixed tohand levers 26 hereinafter described. The bearings are notched atopposite sides adjacent their ends toreceive pms 24 on the shafts of thepawls, which shafts are also provlded a vwith hand-grips 25, by means ofwhich the..

.pawls may be withdrawn in directions radial to the ratchet and byturningthe shafts until the pins 24 .are out of enga ement with Atheir`notches, the pawls may held out y of engagement with the ratchet by thepms .wardencLa shaft 32 is ixed in the front `located directlyrearwardly of the side frame bearing against the outer rims of thebearings and qthus holding the pawls away from the ratchets. Itis tobenoted here' thatv the notches are wider than the pins 24, thuspermitting a limited rocking movement, whereby the active faces of thepawlsmay remain in engagement with the teeth cf the ratchet throughoutthe stroke of the 'pawls,` as hereinafter referred to.I It will beevident, alsothat the pawls are reversible by iirzgmg the hand-grips25fthrough arcs of 'F or operatingthe ratchet nut to move the rodlengthwise'of the jack, and thus raise or lower the lifter 11 the deviceof my invention' is providedwith a pair of handlevers 26 unitedat theirrear ends by a cross bar (not shown) for engagement by the hand of theoperator, torock the lhand-levers up and down about their pivots 27 onthe rear'set of side frame members shoi's'n at 34. This, as will beobvious, causes'the pawls to engage' alternately withvthe ratchet` nutfor rotating it, thus rendering the ratchetdouble acting. By retractingboth the ypawls from `the rat( het nut and so rendering it inoperativethe nut maybe turned by' lian-d to bring-the 10d 16'and the lifterrapidly to any desired positiomafter which the pawls may be ree-engaged4with the ratchet. The frame of the jack is provided near the rear with`brackets 29 carrying-wheels 30 which are m'unted after the manner ofcastersin vertical' bearings 31. At the forside members, saidshaftcarrying wheels 33 at its outer ends forv supportingthe front end.of the jack. 'In the present embodiment of the .invention the handlevers 26 are members 10, thc pivots 27 being on the auxiliary sideframe members 34,v which are bolted to the members 10 by the same bolts'which secure the brackets 29 in place. A

bridge member 35 may be secured to the aux- Je' iliary members 34. ormay be made integral as preferred,'sai d bridge memberfserving to" hold.the sides of thex frame in spaced relation. v

' One advantage of the device thus far described resides in the factthat it may be` very quickly taken apart and re-a'ssembled. Fo lthispurpose a pin 36 extends through a socket '37 pivo'ted at lto the lever12 and through the end of the rod 16 in said socket.

Thispin is held in place merely by friction and can readily be forcedIout of place.

Thereupon the rod can be turned to remove it from the ratchet nut andthe thrust block and when the rod has been-removed Figure 4: shows amodified frm of the\ invention, only so much being` shown as is lil)essential to an understanding thereof. In this form of the invention thesocket member 38 is similar to socket member 37 in Figure 1, but has along thread of rather steep pitch coacting with a like thread on rod 39,these threads being right-hand. A unit 40 on the rod 39 has a left-handthread coacting with a-likef thread on said rod 39, and a ratchet 41 isfast" to the rod. Pavvls (not shown) are actuated to cause rotation ofthe rod and its operation'is like that of the first form except for thereversely-acting screw threads, whichvimpart a more rapid rota.- `tionto the rod and thus accelerate the speed of the movement of the parts,as will be readily understood.

It will be obvious to those skilled in the art that various changes maybe made in my device without departing from the spirit 'of the inventionand therefore I do not limit myself to what is shown in the drawings anddescribed inthe specification but only as indicated in the appendedclaims.

Having thus fully described my said inuntion, what I claim as new anddesirel to .heure by Letters Patent, is

l. A jack comprising a frame, a lifting device at one end thereof,parallel motion mechanism for said lifting device, a threaded rodmovable lengt wise of the frame for operating said paral el motionmechanism, a ratchet having internal threads engaging the threads of therod, hand levers on the frame rearwardly from the ratchet, andoppositely acting reversible pawls on the hand levers engagino' saidratchet, substantially as set acting face-s of the ratchet teeth,substan? tiall-y as set forth.

3. A jack comprising a frame, a lifting device in said frame, a threadedrod removable lengthwise of the frame for operating the lifting device,a. ratchet on said rod adapted to be rotated to move the rodlongitudinally of the frame, said ratchet having teeth spaced about itscircumference, a lever pivoted longitudinally of the frame and havingarms disposed adjacent the periphery of said ratchet, a dog carried bysaid arms, said dog extending inwardly and engaefing said ratchet teeth,substantially as sett` forth.

In witness `whereof, I havel hereunto set.

my hand and seal at Washington, District of Columbia, this twentieth dayof January, A. D. nineteen hundred and twenty-six- AXEL oNIELsEN. [1..s.)

